How Do You Select Only Part Of a Timeline To Be Rendered?
Specifying Render Output Settings

You can specify a specific start frame and end frame for your render in the Dimensions section of the Render tab:


Render tab -> Dimensions section -> set Start Frame and End Frame


If your animation is 250 frames long, but you only want to render frames 50 - 75, then set the Start Frame to 50 and the End Frame to 75.

You can also specify your render format to be AVI RAW in the same window:


Render tab -> Output section -> AVI RAW